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When people are in a positive frame of mind, they think more quickly, and are more likely to collaborate and problem-solve (instead of fight and resist). It applies to the smile-er as much as to the smile-ee: a smile on your face, and in your voice, will increase your own mental agility.

There is no point dwelling on what might or could have been. The past has happened and cannot be changed; it can only be accepted. Life is much simpler and much happier when you always look at what you can do, not what you can't do. Every day is a good day.

As a general rule, I try to fill my brain with optimistic thoughts in order to crowd out the bad ones that sometimes slip in. This is a form of self-hypnosis, using the power of association. The positive thoughts lift my energy, which in turn lifts my mood, and even my immune system.